1939-1948 2nd Gears Interchangeable?

[rotorwrench]

Mac VanPelt could give you a better answer but I think it really depends on which main shaft you have and whether your cluster is a 24 tooth at the 2nd gear mesh or not. The earlier main shaft has to use the correct thrust washers and the pin hole with the 2nd gear corresponding. I think they are enterchangable if the pin hole & thrust washers aren't a factor.